How to redeem an iBooks promo code

On a Mac
  1. Copy the promo code.
  2. Open iBooks app, click on the iBooks Store button (top left of window).
  3. Then just under your account email address there is a link called Redeem.
  4. Click that, enter your Apple password.
  5. Paste the promo code in the field shown.
On an iPhone or iPad
  1. Copy the promo code.
  2. Open iBooks app
  3. Tap on your Avatar (top right of screen).
  4. Scroll down to where it says Redeem Gift Card or Code.
  5. Then just under your account email address there is a link called Redeem.
  6. In the pane that opens, tap into the field that says “You can also enter your code manually“.
    This is just under the Use Camera button.
  7. Now paste your promo code.